Dash pot



sept. 1, 1936.

R. C. SEYFORTH DASH POT Filed NOV. 5, 1954 INV ENTOR.

ATTORNEYS Patented Sept. 1, 1936 l'i'ED STATES ATENT OFFICE Y DASH POT Rome CQSeyforth, Lowell, Mich.

ApplicationNovember 5, 1934, Serial No. 751,521 13 claims. (Criss- 94) The main objects of this invention are: nected thereto, the latter being shown at 26. First, to provide an improved dashpot which Within the cup-like portion 22 and on the inner is well adapted for use as a door check and the side of the end wall 23 thereof I dispose a valve like, member 2l preferably comprising a resilient com- Second, to provide improved means in a device pressible mass such as rubber. The valve mem- 5 of the foregoing character for adjusting the cushber is adapted for coaction with the air Venting ioning or damping'action thereof. flutes 2B to control the air passing through the Third, to provide an improved jointed conopening 24 in responseto the action of the pisnection between the dashpot and the door or the ton I3. like, For manually adjusting the valve member 21 I 10 Objects relating to details and economies of provide a stud or stem 2B extending through the my invention will appear from the description to Valve member and the opening 24, the stem havfollow. The invention is dened and pointed out ing a hat head 29 engaging and supporting the in the claims. Y valve member. For the passage of the stem 28 A structure which is a preferred embodiment the valve member is preferably provided with a 15 of my invention is illustrated in the accompanycentral bore 323 in line with the opening 24. A ing drawing, in which: knurled nut 3I is threaded to the outer end of Fig. lis a fragmentary top plan View of a device the stem for coaction with the outer side of the embodying features of my invention, Va. portion end Wall 23 to adjust the clamping of the valve of the door frame being shown in section. member between the head 29 and the end wall. 20 Fig. 2 is an enlarged fragmentary longitudinal The nut is preferably externally knurled for section taken on a line corresponding to line facilitating its manipulation with the fingers. To 2-2 of Figs. 3 and 4. limit the outward movement of the nut and pre- Fig. 3' is a view partly in end elevation and vent its loss and the loss of the valve member V partly in transverse sectionon line 3-3 of Fig. 2. and stem Within the cylinder, the stem prefer- 25 Fig. 4 is a fragmentary View in front elevation ably terminates at its outer end in a flange or of the jointed connection. Y j j upset 32.

Referring to the drawing, I is a door hinged at The outer edges of the cylinder and end mem- 2 to the frame 3. The door is resiliently urged ber are overlapped and turned outwardly, rear- 30 lto closed position by tension springs 4' connected wardly, and inwardly to provide a reinforced con- 30 to the door at 5 and to the frame at 6. A link nection or double-seam 33 between the parts, 'I hinged to the inner side of the door at 8 is con'- there being a pair of holes 34 at the rear of the nected tothe outer end of the piston rod 9 at I0 connection. The bracket I4 has'a pair of hooks and acts to hold the springs 4 away from the 35 looped around the connection 33 and extend- Y frame 3, especially when the door is opened wide. ing through the holes 34, as shown, the bracket 35 The movement of the' door I is cushioned to being secured to the door I by means of the screw avoid shock in closing by the dashpot. II consist- 36. Thus, a jointed connection is established being of anair cylinder I2 anda piston I3 moving tween the outer end of the dashpot Il and the therein, the outerv end of the dashpot being pivotdoor I. This jointed connection permits a cer- 40 ally connected to the door by means of the tain amount of swinging movement of the dash- 40 bracket I 4. V .Y y pot relative to the door I in the normal movement The outer end of the cylinder I2 is flared at of the latter. I5 and is provided with an end member IB tele- From the foregoing description of my invention `scoped therein, the end member having a wall it will be apparent to those skilled in the art that portion I'I concentrically spaced fromv the ared the cushioning or damping action of the dashpot 45 wall portion I8 of the cylinderto providea flared can be readily adjusted by simply turning the chamber 20 for receiving and expanding :the nut 3l. flanged or cup packingrZI of the piston I3: This The inherent resiliency of the rubber valve keeps the packing in proper working condition member 2l holds the parts in adjusted position for coaction with the cylinder I2. and restricts the ow of air through the radial 50 The end member I 6 has an inwardly facing air venting flutes 25. The resiliency of the rubcentral conical cup-like portion 22,1the Aend'wall ber valve member is also favorable to the de- 23 of the cup-like portion being provided with Vsired operation of the dashpot, in that during the a central air' discharge'opening 24 and radial movement of the plunger toward the outer end corrugations25 forming air venting lfiues, conof the cylinder, when the door is closing, the V155 compressed air between the piston and outer end of the cylinder backs up around the valve member and further restricts the discharge of the air through the flutes 26.

Further, during the movement of the plunger away from the outer end of the cylinder, when the door is opening, the air rushing through the passage acts on the resilient valve member to open to a certain extent, permitting the door to be more easily opened than closed. This is a very desirable feature. The operation of the device is further improved by the action of the expanding chamber 20 for the flanged plunger 2|.

I have illustrated and described my improvements in an embodiment which I have found very practical. I have not attempted to illustrate or describe other embodiments or adaptations as it is believed this disclosure will enable those skilled in the art to embody or adapt my improvements as may be desired.

Although I have shown and described a certain specific embodiment of my invention, I am fully awarev that many modications thereof are possible. My invention is therefore not to be restricted except in so far as is necessitated by the prior art and by the spirit of the appended claims.. v l f y Having thus described my invention what I claim as newvand desire to secure by Letters Patent is: Y.

1 1. A dashpot comprising a cylinder having a ared end, a piston in said cylinder having a anged packing, an end member telescoped in the ared end of said cylinder and having a Wall portion concentrically spaced within the flared wall portion of said cylinder to provide a flared chamber for receiving and expanding said packing, the end member having a centrally inwardly facing conical cup-like portion, the end wall of said cup-like portion having a central air discharge opening and radial corrugations providing air venting flutes connected thereto, a valve member of resilient material seated on said end wall for coaction with said air venting utes to control the air. discharged 4from the cylinder, and means for adjusting the action of said valve member, comprising a stem extending through rthe valve member and said opening and having a head engaging said valve member, and means at the outer end of said stem for coaction with the youter side Vof said end wall to adjust the clamping of said valve member between said head andsaid end wall.

`2. A dashpot comprising a cylinder having a flared end, a piston in said cylinder having a flanged packing, an end member telescoped in the ared end of said cylinder and having a wall portion concentrically spaced within the flared wall portion of said cylinder to provide a flared chamber for receivingY and expanding said packing, the end member having a central conical cup-like portion facing said piston, the end wall of said cup-like portion having a central air discharge opening and radial corrugations providing air venting flutes connected thereto, a valve member of resilient material seated on said end wall for coaction with said air venting flutes to control the air discharged from the cylinder, and means for adjusting the action of said valve member, comprising a bolt extending through the valve member and said opening and having a head engaging said valve member, and a nut for coaction with the outer side of said end Wall to adjust the clamping of said valve member between said head and said end Wall.

3. A dashpot comprising a cylinder having a flared end, a piston in said cylinder having a flanged packing, an end member telescoped in the flared end of ysaid cylinder and having a wall portion concentrically spaced Within the flared wall portion of said cylinder to provide a ared chamber for receiving and expanding said packing, the end member having a central conical cup-like portion facing said piston, theend wall of said cup-likel portion having a central air discharge opening and radial corrugations providing air venting flutes connected thereto, a valve lmember of resilient material seated on said end wall for coaction with said air venting ilutes to control the air discharged from the cylinder,

` and means for adjusting the action of said valve member.

4. A dashpot comprising a cylinder having a flared end, a piston in said cylinder having a cup packing, an end member telescoped in the flared end of said cylinder and having a wall portion concentrically spaced within the flared wall portion of said cylinder to provide a flared chamber for receiving and expanding said packing, theVV end member having a central conical cup-like portion facing said piston, the end wall of said cup-like portion having a central Yair discharge opening and radial corrugations providing air venting utes connected thereto, and a valve member of resilient material seated on said end wall for coaction with said air venting flutes to control the air discharged from the cylinder.

5. A dashpot comprising a cylinder having a flared end, a piston in said cylinder having a cuppacking, an end member telescoped in the ared end of said cylinder and having a Wall portion joined to the fiared end of said cylinder and havl ing a flared portion disposed in spaced concentric relation to the ared end of said cylinder to provide an annular recess adapted to receive the ange portions of a cup-packing, said end Wall having a cup-like inwardly facing central portion, a piston in said cylinder provided with a cup-packing, the flange of which is adapted when the piston is at the inner end of its stroke to enter the said annular packing'l recess, there beinga vent opening inthe said central cupy portion of said end Wall, a resilient valve disposed within said cup portion of said end wall to coact with said vvent opening, the valve being provided with a threaded stem projecting through the end wall, and a nut on said stem whereby the escape of air through the vent opening may be adjusted from themanipulation of said nut.

V7. In a dashpot, the combination with-an air 'cylinder having a flared inner end,of an end Wall joined to the flared end of said cylinder and having a ared portion disposed in spaced concentric relation to the flared end of said cylinder to provide an annular recess adapted to receive the flange portions of a cup-packing, said end Wall a piston insaid cylinder provided with a cup packing, the flange of which is adapted when the piston is at the inner end of its stroke to enter the said annular packing recess, there being a vent opening in the said central cup portion of said end wall, a valve disposed Within said cup portion of said end wall to coact with said vent opening, and means at the outside of said cylinder for adjusting said valve.

8. In a dashpot, the combination with an air cylinder having an end wall with a cup-like inwardly facing central portion, there being radial venting utes and a vent opening in the said central cup portion of said end wall, a resilient valve extending inwardly from said end wall and disposed within said cup portion of said end wall to coact with said vent opening, the valve being provided With a threaded stem projecting through the end wall, and a nut on said stem whereby the escape of air through the flutes and the vent opening may be adjusted from the manipulation of said nut.

9. In a dashpot, the combination with an air cylinder having an end wall with a cup-like inwardly facing central portion, there being radial venting utes and a vent opening in the said central cup portion of said end wall, a valve extending inwardly from said end wall and disposed within said cup portion of said end wall to coact with said vent opening, and means at the outside of said cylinder for adjusting said valve.

10. In a dashpot, the combination with a cylinder and a piston, the cylinder having an end wall provided with a central air discharge opening and radial air venting corrugations extending thereto, of a rubber valve member disposed on the inner side of said end wall and having a central bore, a stem arranged through said bore and said opening and having a head engaging said valve member, and a nut threaded to said stern at the outer side of said end wall for coa'ction therewith to control the action of said valve member relative to Said corrugations in limiting the discharge of ail' therethrough.

11. In a dashpot, the combination with a cylinder and a piston, the cylinder having an end wall provided with a central air discharge opening and radial air venting corrugations extending thereto, of a valve member disposed on the inner side of said end wall and having a central bore, a stem arranged through said bore and said opening and having a head engaging said valve member, and means threaded to said stem at the outer side of said end wall for coaction therewith to control the action of said valve member relative to said corrugations in limiting the discharge of air therethrough.

12. In a dashpot, the combination with a cylinder and a piston, the cylinder having an end Wall provided with a central fluid discharge vent and radial venting flutes, of a yieldable valve member disposed on the inner side of said end wall and a stem arranged through said vent to control the action of said valve member relative to said uid Vent in limiting the discharge of uid therethrough, said valve member abutting said end wall and regulably governing the discharge capacity of said venting flutes.

13. In a dashpot, the combination with a cylinder and a piston, the cylinder having a fluid discharge vent, of a yieldable valve member venting flutes communicating with said vent, and a stem arranged through said vent to 'control the action of said valve member relative to said fluid vent in regulating the discharge of uid therethrough, said valve member acting to control the discharge capacity of said flutes.

ROME C. SEYFORTH. 

